Enhance backend and frontend setup with MySQL integration, Docker configurations, and toast notifications

- Updated .gitignore to include additional environment and build files
- Configured Dockerfiles for backend and frontend with npm install and port exposure
- Added MySQL connection pool and query function in backend services
- Implemented form submission with toast notifications in MainForm component
- Updated package.json and package-lock.json for new dependencies
- Enhanced routing and layout in frontend with toast notifications

backend/package.json

@@ -14,6 +14,7 @@
     "cors": "^2.8.5",
     "dotenv": "^17.2.1",
     "ejs": "^3.1.10",
-    "express": "^5.1.0"
+    "express": "^5.1.0",
+    "mysql2": "^3.14.3"
   }
 }